Revert "rcu: Permit rt_mutex_unlock() with irqs disabled"

#endif /* #else #ifdef CONFIG_RCU_TRACE */

static struct lock_class_key rcu_boost_class;

/*

 * Carry out RCU priority boosting on the task indicated by ->exp_tasks

 * or ->boost_tasks, advancing the pointer to the next task in the

	 */

	t = container_of(tb, struct task_struct, rcu_node_entry);

	rt_mutex_init_proxy_locked(&mtx, t);

	/* Avoid lockdep false positives.  This rt_mutex is its own thing. */

	lockdep_set_class_and_name(&mtx.wait_lock, &rcu_boost_class,

				   "rcu_boost_mutex");

	t->rcu_boost_mutex = &mtx;

	raw_spin_unlock_irqrestore(&rnp->lock, flags);

	rt_mutex_lock(&mtx);  /* Side effect: boosts task t's priority. */

		    struct rt_mutex_waiter *waiter)

{

	int ret = 0;

	int was_disabled;

	for (;;) {

		/* Try to acquire the lock: */

		raw_spin_unlock(&lock->wait_lock);

		was_disabled = irqs_disabled();

		if (was_disabled)

			local_irq_enable();

		debug_rt_mutex_print_deadlock(waiter);

		schedule_rt_mutex(lock);

		if (was_disabled)

			local_irq_disable();

		raw_spin_lock(&lock->wait_lock);

		set_current_state(state);

	}